My ac guys came today and installed a heat pump on top of an addition. They
did it before the roofer roofed. Is this common? Shouldn't they have
roofed first? It's going to be metal roof.

They also put in a dryer vent. A box at the bottom, then a straight pipe.
They cut a hole in the roof, but one truss over from the pipe. I'm
ass-u-ming that they cut the hole in the wrong place, as there's a 3' piece
of pipe sitting there on the floor not connected. The top of the vent pipe
runs to the top of the top plate. I don't want any flex in there, as it
would be a tight flex because it's a slightly sloped roof, and it would take
two tight flexes to make it to the hole they cut. Dryer vents are best when
a straight shot, right?

Steve